System and method for a robust preamble and transmission delimiting in a switched-carrier transceiver
First Claim
1. A method for adapting transmission rate in a communication device over a communication channel by including rate information in a first portion of a communication message, comprising the steps of:
- transmitting the first portion at a first rate, the first portion operating to frame the message and to delimit the message from silence and including rate information specifying a rate at which data in a second portion of the communication message is transmitted; and
transmitting the data at a second rate specified by the rate information included in the first portion.
3 Assignments
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Accused Products
Abstract
A method and system for robust delimiting of messages in switched-carrier operation in which a preamble precedes each message. The preamble comprises symbols transmitted at a rate lower than that of the following data. The lower rate significantly increases the probability that decoding of the preamble symbols will be error-free. Communication line control information can be included in the preamble, thereby ensuring that line control information is reliably transferred over the channel. The preamble'"'"'s first symbol can be transmitted at the lower symbol rate and at an increased power level, thereby reliably delimiting the beginning of a transmission. The end of the message can be reliably delimited by sending the first symbol which contains only bits from a next cell of information at a lower symbol rate, and including an extra bit in that symbol. The extra bfit can indicate to a receiver when the last cell of information begins.
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Citations
20 Claims
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1. A method for adapting transmission rate in a communication device over a communication channel by including rate information in a first portion of a communication message, comprising the steps of:
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transmitting the first portion at a first rate, the first portion operating to frame the message and to delimit the message from silence and including rate information specifying a rate at which data in a second portion of the communication message is transmitted; and
transmitting the data at a second rate specified by the rate information included in the first portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12)
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9. A computer-readable medium containing a program for adapting transmission rate in a communication device over a communication channel by including rate information in a first portion of a communication message, the program comprising the steps of:
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transmitting the first portion at a first rate, the first portion operating to frame the message and to delimit the message from silence and including rate information specifying a rate at which data in a second portion of the communication message is transmitted; and
transmitting the data at a second rate specified by the rate information included in the first portion. - View Dependent Claims (10, 11, 13, 14, 15, 16)
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17. An apparatus for adapting transmission rate in a communication device over a communication channel by including rate information in a first portion of a communication message, the apparatus comprising:
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first logic configured to transmit the first portion at a first rate, the first portion operating to frame the message and to delimit the message from silence and including rate information specifying a rate at which data in a second portion of the communication message is transmitted; and
second logic configured to transmit the data at a second rate specified by the rate information included in the first portion. - View Dependent Claims (18, 19, 20)
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Specification